peanut corporation in new mexico they make peanut butter, sunland, trader joe's, harry and david and sprouts and the archer brand sold at target. >> all the illnesses investigated are related to peanut butter products from the plant. >> reporter: the company says to look on the side of the jar if the "best if used by" date is between may 1st and september 24, 2013. throw it away. what if your family has gone through half of the jar, what are the signs? >> high fever, stomach cramps, dysentery which can show up in one to three days. we spoke to families of children who got sick, they tell us stories of 103 degree fevers that may have last ford days. they were shocked to realize it may have started with their peanut butter. steve-o sun na o to our website, abc news,.com, to get more information on particular brand. i ha steve osunsami, abc news, atlanta. >> go to our website, abc news,.com, to get more information on particular brand. i have trader joe's in my cabinet. it's not the valencia peanut butter. still hesitant to eat it. it's not that particular style of peanut butter. >>